One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,7)(3,4,8,6)(11,15)(14,16)(17,18,20,21)(19,22,23,24)(26,29)(27,31)(1,3,5,8)(2,6,7,4)(10,13)(14,16)(18,21)(19,23)(1,2)(3,4)(5,7)(6,8)(9,10)(11,14)(12,13)(15,16)(17,18)(19,22)(20,21)(23,24)(25,26)(27,32)(28,29)(30,31) involution — undirected(1,4)(2,3)(5,6)(7,8)(25,27)(26,30)(28,31)(29,32) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,11,12,15)(10,14,13,16)(17,19)(18,22)(20,23)(21,24)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.